(honeywell wifi smart thermostat part number RTH9580), Is it compatible with Carrier and Gree?

anyone know about honeywell wifi smart thermostat part number RTH9580 compatibility with Carrier and Gree ?

You’re going to need some model numbers for Carrier. There are hundreds. I have one of the more top of the line forced air, nat gas and AC and it is not compatible with ANYTHING - for an example.

You will need to first be able to have your laptop connected to the Honeywell Total Connect Comfort site and than Install one of the Honeywell wifi thermostats via the SmartThings market place.
Create an account and add your thermostate there:
you can find instructions on that on the ST forumes.

Gree - is it a split unit - HVAC unit? One with IR control.

If so - No way…

Hi @rshdmpm,

If you added your thermostat to the site I talked about earlier, you should be able to add it to SmartThings as per my screenshot: